code: def boxrgb():
      return PIL.Image.open("tests/images/box_5x5_rgb.png")
  
imports: import pytest
  import numpy
  from eli5.base import Explanation, TargetExplanation
  from eli5.formatters.image import format_as_image, heatmap_to_image, expand_heatmap, _validate_heatmap, _update_alpha, _cap_alpha, _overlay_heatmap
  from .utils_image import assert_pixel_by_pixel_equal
label_desc: Use image node_id 2 for calling a global function with example usage: boxrgb() and returns: PIL